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-rw-r--r--net/dsa/dsa2.c1829
1 files changed, 1829 insertions, 0 deletions
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
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+++ b/net/dsa/dsa2.c
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/dsa/dsa2.c - Hardware switch handling, binding version 2
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
+ * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/rtnetlink.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+#include <net/devlink.h>
+#include <net/sch_generic.h>
+
+#include "dsa_priv.h"
+
+static DEFINE_MUTEX(dsa2_mutex);
+LIST_HEAD(dsa_tree_list);
+
+/* Track the bridges with forwarding offload enabled */
+static unsigned long dsa_fwd_offloading_bridges;
+
+/**
+ * dsa_tree_notify - Execute code for all switches in a DSA switch tree.
+ * @dst: collection of struct dsa_switch devices to notify.
+ * @e: event, must be of type DSA_NOTIFIER_*
+ * @v: event-specific value.
+ *
+ * Given a struct dsa_switch_tree, this can be used to run a function once for
+ * each member DSA switch. The other alternative of traversing the tree is only
+ * through its ports list, which does not uniquely list the switches.
+ */
+int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v)
+{
+ struct raw_notifier_head *nh = &dst->nh;
+ int err;
+
+ err = raw_notifier_call_chain(nh, e, v);
+
+ return notifier_to_errno(err);
+}
+
+/**
+ * dsa_broadcast - Notify all DSA trees in the system.
+ * @e: event, must be of type DSA_NOTIFIER_*
+ * @v: event-specific value.
+ *
+ * Can be used to notify the switching fabric of events such as cross-chip
+ * bridging between disjoint trees (such as islands of tagger-compatible
+ * switches bridged by an incompatible middle switch).
+ *
+ * WARNING: this function is not reliable during probe time, because probing
+ * between trees is asynchronous and not all DSA trees might have probed.
+ */
+int dsa_broadcast(unsigned long e, void *v)
+{
+ struct dsa_switch_tree *dst;
+ int err = 0;
+
+ list_for_each_entry(dst, &dsa_tree_list, list) {
+ err = dsa_tree_notify(dst, e, v);
+ if (err)
+ break;
+ }
+
+ return err;
+}
+
+/**
+ * dsa_lag_map() - Map LAG structure to a linear LAG array
+ * @dst: Tree in which to record the mapping.
+ * @lag: LAG structure that is to be mapped to the tree's array.
+ *
+ * dsa_lag_id/dsa_lag_by_id can then be used to translate between the
+ * two spaces. The size of the mapping space is determined by the
+ * driver by setting ds->num_lag_ids. It is perfectly legal to leave
+ * it unset if it is not needed, in which case these functions become
+ * no-ops.
+ */
+void dsa_lag_map(struct dsa_switch_tree *dst, struct dsa_lag *lag)
+{
+ unsigned int id;
+
+ for (id = 1; id <= dst->lags_len; id++) {
+ if (!dsa_lag_by_id(dst, id)) {
+ dst->lags[id - 1] = lag;
+ lag->id = id;
+ return;
+ }
+ }
+
+ /* No IDs left, which is OK. Some drivers do not need it. The
+ * ones that do, e.g. mv88e6xxx, will discover that dsa_lag_id
+ * returns an error for this device when joining the LAG. The
+ * driver can then return -EOPNOTSUPP back to DSA, which will
+ * fall back to a software LAG.
+ */
+}
+
+/**
+ * dsa_lag_unmap() - Remove a LAG ID mapping
+ * @dst: Tree in which the mapping is recorded.
+ * @lag: LAG structure that was mapped.
+ *
+ * As there may be multiple users of the mapping, it is only removed
+ * if there are no other references to it.
+ */
+void dsa_lag_unmap(struct dsa_switch_tree *dst, struct dsa_lag *lag)
+{
+ unsigned int id;
+
+ dsa_lags_foreach_id(id, dst) {
+ if (dsa_lag_by_id(dst, id) == lag) {
+ dst->lags[id - 1] = NULL;
+ lag->id = 0;
+ break;
+ }
+ }
+}
+
+struct dsa_lag *dsa_tree_lag_find(struct dsa_switch_tree *dst,
+ const struct net_device *lag_dev)
+{
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list)
+ if (dsa_port_lag_dev_get(dp) == lag_dev)
+ return dp->lag;
+
+ return NULL;
+}
+
+struct dsa_bridge *dsa_tree_bridge_find(struct dsa_switch_tree *dst,
+ const struct net_device *br)
+{
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list)
+ if (dsa_port_bridge_dev_get(dp) == br)
+ return dp->bridge;
+
+ return NULL;
+}
+
+static int dsa_bridge_num_find(const struct net_device *bridge_dev)
+{
+ struct dsa_switch_tree *dst;
+
+ list_for_each_entry(dst, &dsa_tree_list, list) {
+ struct dsa_bridge *bridge;
+
+ bridge = dsa_tree_bridge_find(dst, bridge_dev);
+ if (bridge)
+ return bridge->num;
+ }
+
+ return 0;
+}
+
+unsigned int dsa_bridge_num_get(const struct net_device *bridge_dev, int max)
+{
+ unsigned int bridge_num = dsa_bridge_num_find(bridge_dev);
+
+ /* Switches without FDB isolation support don't get unique
+ * bridge numbering
+ */
+ if (!max)
+ return 0;
+
+ if (!bridge_num) {
+ /* First port that requests FDB isolation or TX forwarding
+ * offload for this bridge
+ */
+ bridge_num = find_next_zero_bit(&dsa_fwd_offloading_bridges,
+ DSA_MAX_NUM_OFFLOADING_BRIDGES,
+ 1);
+ if (bridge_num >= max)
+ return 0;
+
+ set_bit(bridge_num, &dsa_fwd_offloading_bridges);
+ }
+
+ return bridge_num;
+}
+
+void dsa_bridge_num_put(const struct net_device *bridge_dev,
+ unsigned int bridge_num)
+{
+ /* Since we refcount bridges, we know that when we call this function
+ * it is no longer in use, so we can just go ahead and remove it from
+ * the bit mask.
+ */
+ clear_bit(bridge_num, &dsa_fwd_offloading_bridges);
+}
+
+struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
+{
+ struct dsa_switch_tree *dst;
+ struct dsa_port *dp;
+
+ list_for_each_entry(dst, &dsa_tree_list, list) {
+ if (dst->index != tree_index)
+ continue;
+
+ list_for_each_entry(dp, &dst->ports, list) {
+ if (dp->ds->index != sw_index)
+ continue;
+
+ return dp->ds;
+ }
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(dsa_switch_find);
+
+static struct dsa_switch_tree *dsa_tree_find(int index)
+{
+ struct dsa_switch_tree *dst;
+
+ list_for_each_entry(dst, &dsa_tree_list, list)
+ if (dst->index == index)
+ return dst;
+
+ return NULL;
+}
+
+static struct dsa_switch_tree *dsa_tree_alloc(int index)
+{
+ struct dsa_switch_tree *dst;
+
+ dst = kzalloc(sizeof(*dst), GFP_KERNEL);
+ if (!dst)
+ return NULL;
+
+ dst->index = index;
+
+ INIT_LIST_HEAD(&dst->rtable);
+
+ INIT_LIST_HEAD(&dst->ports);
+
+ INIT_LIST_HEAD(&dst->list);
+ list_add_tail(&dst->list, &dsa_tree_list);
+
+ kref_init(&dst->refcount);
+
+ return dst;
+}
+
+static void dsa_tree_free(struct dsa_switch_tree *dst)
+{
+ if (dst->tag_ops)
+ dsa_tag_driver_put(dst->tag_ops);
+ list_del(&dst->list);
+ kfree(dst);
+}
+
+static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
+{
+ if (dst)
+ kref_get(&dst->refcount);
+
+ return dst;
+}
+
+static struct dsa_switch_tree *dsa_tree_touch(int index)
+{
+ struct dsa_switch_tree *dst;
+
+ dst = dsa_tree_find(index);
+ if (dst)
+ return dsa_tree_get(dst);
+ else
+ return dsa_tree_alloc(index);
+}
+
+static void dsa_tree_release(struct kref *ref)
+{
+ struct dsa_switch_tree *dst;
+
+ dst = container_of(ref, struct dsa_switch_tree, refcount);
+
+ dsa_tree_free(dst);
+}
+
+static void dsa_tree_put(struct dsa_switch_tree *dst)
+{
+ if (dst)
+ kref_put(&dst->refcount, dsa_tree_release);
+}
+
+static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
+ struct device_node *dn)
+{
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list)
+ if (dp->dn == dn)
+ return dp;
+
+ return NULL;
+}
+
+static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
+ struct dsa_port *link_dp)
+{
+ struct dsa_switch *ds = dp->ds;
+ struct dsa_switch_tree *dst;
+ struct dsa_link *dl;
+
+ dst = ds->dst;
+
+ list_for_each_entry(dl, &dst->rtable, list)
+ if (dl->dp == dp && dl->link_dp == link_dp)
+ return dl;
+
+ dl = kzalloc(sizeof(*dl), GFP_KERNEL);
+ if (!dl)
+ return NULL;
+
+ dl->dp = dp;
+ dl->link_dp = link_dp;
+
+ INIT_LIST_HEAD(&dl->list);
+ list_add_tail(&dl->list, &dst->rtable);
+
+ return dl;
+}
+
+static bool dsa_port_setup_routing_table(struct dsa_port *dp)
+{
+ struct dsa_switch *ds = dp->ds;
+ struct dsa_switch_tree *dst = ds->dst;
+ struct device_node *dn = dp->dn;
+ struct of_phandle_iterator it;
+ struct dsa_port *link_dp;
+ struct dsa_link *dl;
+ int err;
+
+ of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
+ link_dp = dsa_tree_find_port_by_node(dst, it.node);
+ if (!link_dp) {
+ of_node_put(it.node);
+ return false;
+ }
+
+ dl = dsa_link_touch(dp, link_dp);
+ if (!dl) {
+ of_node_put(it.node);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
+{
+ bool complete = true;
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list) {
+ if (dsa_port_is_dsa(dp)) {
+ complete = dsa_port_setup_routing_table(dp);
+ if (!complete)
+ break;
+ }
+ }
+
+ return complete;
+}
+
+static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list)
+ if (dsa_port_is_cpu(dp))
+ return dp;
+
+ return NULL;
+}
+
+struct net_device *dsa_tree_find_first_master(struct dsa_switch_tree *dst)
+{
+ struct device_node *ethernet;
+ struct net_device *master;
+ struct dsa_port *cpu_dp;
+
+ cpu_dp = dsa_tree_find_first_cpu(dst);
+ ethernet = of_parse_phandle(cpu_dp->dn, "ethernet", 0);
+ master = of_find_net_device_by_node(ethernet);
+ of_node_put(ethernet);
+
+ return master;
+}
+
+/* Assign the default CPU port (the first one in the tree) to all ports of the
+ * fabric which don't already have one as part of their own switch.
+ */
+static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *cpu_dp, *dp;
+
+ cpu_dp = dsa_tree_find_first_cpu(dst);
+ if (!cpu_dp) {
+ pr_err("DSA: tree %d has no CPU port\n", dst->index);
+ return -EINVAL;
+ }
+
+ list_for_each_entry(dp, &dst->ports, list) {
+ if (dp->cpu_dp)
+ continue;
+
+ if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
+ dp->cpu_dp = cpu_dp;
+ }
+
+ return 0;
+}
+
+/* Perform initial assignment of CPU ports to user ports and DSA links in the
+ * fabric, giving preference to CPU ports local to each switch. Default to
+ * using the first CPU port in the switch tree if the port does not have a CPU
+ * port local to this switch.
+ */
+static int dsa_tree_setup_cpu_ports(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *cpu_dp, *dp;
+
+ list_for_each_entry(cpu_dp, &dst->ports, list) {
+ if (!dsa_port_is_cpu(cpu_dp))
+ continue;
+
+ /* Prefer a local CPU port */
+ dsa_switch_for_each_port(dp, cpu_dp->ds) {
+ /* Prefer the first local CPU port found */
+ if (dp->cpu_dp)
+ continue;
+
+ if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
+ dp->cpu_dp = cpu_dp;
+ }
+ }
+
+ return dsa_tree_setup_default_cpu(dst);
+}
+
+static void dsa_tree_teardown_cpu_ports(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list)
+ if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
+ dp->cpu_dp = NULL;
+}
+
+static int dsa_port_devlink_setup(struct dsa_port *dp)
+{
+ struct devlink_port *dlp = &dp->devlink_port;
+ struct dsa_switch_tree *dst = dp->ds->dst;
+ struct devlink_port_attrs attrs = {};
+ struct devlink *dl = dp->ds->devlink;
+ struct dsa_switch *ds = dp->ds;
+ const unsigned char *id;
+ unsigned char len;
+ int err;
+
+ memset(dlp, 0, sizeof(*dlp));
+ devlink_port_init(dl, dlp);
+
+ if (ds->ops->port_setup) {
+ err = ds->ops->port_setup(ds, dp->index);
+ if (err)
+ return err;
+ }
+
+ id = (const unsigned char *)&dst->index;
+ len = sizeof(dst->index);
+
+ attrs.phys.port_number = dp->index;
+ memcpy(attrs.switch_id.id, id, len);
+ attrs.switch_id.id_len = len;
+
+ switch (dp->type) {
+ case DSA_PORT_TYPE_UNUSED:
+ attrs.flavour = DEVLINK_PORT_FLAVOUR_UNUSED;
+ break;
+ case DSA_PORT_TYPE_CPU:
+ attrs.flavour = DEVLINK_PORT_FLAVOUR_CPU;
+ break;
+ case DSA_PORT_TYPE_DSA:
+ attrs.flavour = DEVLINK_PORT_FLAVOUR_DSA;
+ break;
+ case DSA_PORT_TYPE_USER:
+ attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
+ break;
+ }
+
+ devlink_port_attrs_set(dlp, &attrs);
+ err = devlink_port_register(dl, dlp, dp->index);
+ if (err) {
+ if (ds->ops->port_teardown)
+ ds->ops->port_teardown(ds, dp->index);
+ return err;
+ }
+
+ return 0;
+}
+
+static void dsa_port_devlink_teardown(struct dsa_port *dp)
+{
+ struct devlink_port *dlp = &dp->devlink_port;
+ struct dsa_switch *ds = dp->ds;
+
+ devlink_port_unregister(dlp);
+
+ if (ds->ops->port_teardown)
+ ds->ops->port_teardown(ds, dp->index);
+
+ devlink_port_fini(dlp);
+}
+
+static int dsa_port_setup(struct dsa_port *dp)
+{
+ struct devlink_port *dlp = &dp->devlink_port;
+ bool dsa_port_link_registered = false;
+ struct dsa_switch *ds = dp->ds;
+ bool dsa_port_enabled = false;
+ int err = 0;
+
+ if (dp->setup)
+ return 0;
+
+ err = dsa_port_devlink_setup(dp);
+ if (err)
+ return err;
+
+ switch (dp->type) {
+ case DSA_PORT_TYPE_UNUSED:
+ dsa_port_disable(dp);
+ break;
+ case DSA_PORT_TYPE_CPU:
+ if (dp->dn) {
+ err = dsa_shared_port_link_register_of(dp);
+ if (err)
+ break;
+ dsa_port_link_registered = true;
+ } else {
+ dev_warn(ds->dev,
+ "skipping link registration for CPU port %d\n",
+ dp->index);
+ }
+
+ err = dsa_port_enable(dp, NULL);
+ if (err)
+ break;
+ dsa_port_enabled = true;
+
+ break;
+ case DSA_PORT_TYPE_DSA:
+ if (dp->dn) {
+ err = dsa_shared_port_link_register_of(dp);
+ if (err)
+ break;
+ dsa_port_link_registered = true;
+ } else {
+ dev_warn(ds->dev,
+ "skipping link registration for DSA port %d\n",
+ dp->index);
+ }
+
+ err = dsa_port_enable(dp, NULL);
+ if (err)
+ break;
+ dsa_port_enabled = true;
+
+ break;
+ case DSA_PORT_TYPE_USER:
+ of_get_mac_address(dp->dn, dp->mac);
+ err = dsa_slave_create(dp);
+ if (err)
+ break;
+
+ devlink_port_type_eth_set(dlp, dp->slave);
+ break;
+ }
+
+ if (err && dsa_port_enabled)
+ dsa_port_disable(dp);
+ if (err && dsa_port_link_registered)
+ dsa_shared_port_link_unregister_of(dp);
+ if (err) {
+ dsa_port_devlink_teardown(dp);
+ return err;
+ }
+
+ dp->setup = true;
+
+ return 0;
+}
+
+static void dsa_port_teardown(struct dsa_port *dp)
+{
+ struct devlink_port *dlp = &dp->devlink_port;
+
+ if (!dp->setup)
+ return;
+
+ devlink_port_type_clear(dlp);
+
+ switch (dp->type) {
+ case DSA_PORT_TYPE_UNUSED:
+ break;
+ case DSA_PORT_TYPE_CPU:
+ dsa_port_disable(dp);
+ if (dp->dn)
+ dsa_shared_port_link_unregister_of(dp);
+ break;
+ case DSA_PORT_TYPE_DSA:
+ dsa_port_disable(dp);
+ if (dp->dn)
+ dsa_shared_port_link_unregister_of(dp);
+ break;
+ case DSA_PORT_TYPE_USER:
+ if (dp->slave) {
+ dsa_slave_destroy(dp->slave);
+ dp->slave = NULL;
+ }
+ break;
+ }
+
+ dsa_port_devlink_teardown(dp);
+
+ dp->setup = false;
+}
+
+static int dsa_port_setup_as_unused(struct dsa_port *dp)
+{
+ dp->type = DSA_PORT_TYPE_UNUSED;
+ return dsa_port_setup(dp);
+}
+
+static int dsa_devlink_info_get(struct devlink *dl,
+ struct devlink_info_req *req,
+ struct netlink_ext_ack *extack)
+{
+ struct dsa_switch *ds = dsa_devlink_to_ds(dl);
+
+ if (ds->ops->devlink_info_get)
+ return ds->ops->devlink_info_get(ds, req, extack);
+
+ return -EOPNOTSUPP;
+}
+
+static int dsa_devlink_sb_pool_get(struct devlink *dl,
+ unsigned int sb_index, u16 pool_index,
+ struct devlink_sb_pool_info *pool_info)
+{
+ struct dsa_switch *ds = dsa_devlink_to_ds(dl);
+
+ if (!ds->ops->devlink_sb_pool_get)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_pool_get(ds, sb_index, pool_index,
+ pool_info);
+}
+
+static int dsa_devlink_sb_pool_set(struct devlink *dl, unsigned int sb_index,
+ u16 pool_index, u32 size,
+ enum devlink_sb_threshold_type threshold_type,
+ struct netlink_ext_ack *extack)
+{
+ struct dsa_switch *ds = dsa_devlink_to_ds(dl);
+
+ if (!ds->ops->devlink_sb_pool_set)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_pool_set(ds, sb_index, pool_index, size,
+ threshold_type, extack);
+}
+
+static int dsa_devlink_sb_port_pool_get(struct devlink_port *dlp,
+ unsigned int sb_index, u16 pool_index,
+ u32 *p_threshold)
+{
+ struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
+ int port = dsa_devlink_port_to_port(dlp);
+
+ if (!ds->ops->devlink_sb_port_pool_get)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_port_pool_get(ds, port, sb_index,
+ pool_index, p_threshold);
+}
+
+static int dsa_devlink_sb_port_pool_set(struct devlink_port *dlp,
+ unsigned int sb_index, u16 pool_index,
+ u32 threshold,
+ struct netlink_ext_ack *extack)
+{
+ struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
+ int port = dsa_devlink_port_to_port(dlp);
+
+ if (!ds->ops->devlink_sb_port_pool_set)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_port_pool_set(ds, port, sb_index,
+ pool_index, threshold, extack);
+}
+
+static int
+dsa_devlink_sb_tc_pool_bind_get(struct devlink_port *dlp,
+ unsigned int sb_index, u16 tc_index,
+ enum devlink_sb_pool_type pool_type,
+ u16 *p_pool_index, u32 *p_threshold)
+{
+ struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
+ int port = dsa_devlink_port_to_port(dlp);
+
+ if (!ds->ops->devlink_sb_tc_pool_bind_get)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_tc_pool_bind_get(ds, port, sb_index,
+ tc_index, pool_type,
+ p_pool_index, p_threshold);
+}
+
+static int
+dsa_devlink_sb_tc_pool_bind_set(struct devlink_port *dlp,
+ unsigned int sb_index, u16 tc_index,
+ enum devlink_sb_pool_type pool_type,
+ u16 pool_index, u32 threshold,
+ struct netlink_ext_ack *extack)
+{
+ struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
+ int port = dsa_devlink_port_to_port(dlp);
+
+ if (!ds->ops->devlink_sb_tc_pool_bind_set)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_tc_pool_bind_set(ds, port, sb_index,
+ tc_index, pool_type,
+ pool_index, threshold,
+ extack);
+}
+
+static int dsa_devlink_sb_occ_snapshot(struct devlink *dl,
+ unsigned int sb_index)
+{
+ struct dsa_switch *ds = dsa_devlink_to_ds(dl);
+
+ if (!ds->ops->devlink_sb_occ_snapshot)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_occ_snapshot(ds, sb_index);
+}
+
+static int dsa_devlink_sb_occ_max_clear(struct devlink *dl,
+ unsigned int sb_index)
+{
+ struct dsa_switch *ds = dsa_devlink_to_ds(dl);
+
+ if (!ds->ops->devlink_sb_occ_max_clear)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_occ_max_clear(ds, sb_index);
+}
+
+static int dsa_devlink_sb_occ_port_pool_get(struct devlink_port *dlp,
+ unsigned int sb_index,
+ u16 pool_index, u32 *p_cur,
+ u32 *p_max)
+{
+ struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
+ int port = dsa_devlink_port_to_port(dlp);
+
+ if (!ds->ops->devlink_sb_occ_port_pool_get)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_occ_port_pool_get(ds, port, sb_index,
+ pool_index, p_cur, p_max);
+}
+
+static int
+dsa_devlink_sb_occ_tc_port_bind_get(struct devlink_port *dlp,
+ unsigned int sb_index, u16 tc_index,
+ enum devlink_sb_pool_type pool_type,
+ u32 *p_cur, u32 *p_max)
+{
+ struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp);
+ int port = dsa_devlink_port_to_port(dlp);
+
+ if (!ds->ops->devlink_sb_occ_tc_port_bind_get)
+ return -EOPNOTSUPP;
+
+ return ds->ops->devlink_sb_occ_tc_port_bind_get(ds, port,
+ sb_index, tc_index,
+ pool_type, p_cur,
+ p_max);
+}
+
+static const struct devlink_ops dsa_devlink_ops = {
+ .info_get = dsa_devlink_info_get,
+ .sb_pool_get = dsa_devlink_sb_pool_get,
+ .sb_pool_set = dsa_devlink_sb_pool_set,
+ .sb_port_pool_get = dsa_devlink_sb_port_pool_get,
+ .sb_port_pool_set = dsa_devlink_sb_port_pool_set,
+ .sb_tc_pool_bind_get = dsa_devlink_sb_tc_pool_bind_get,
+ .sb_tc_pool_bind_set = dsa_devlink_sb_tc_pool_bind_set,
+ .sb_occ_snapshot = dsa_devlink_sb_occ_snapshot,
+ .sb_occ_max_clear = dsa_devlink_sb_occ_max_clear,
+ .sb_occ_port_pool_get = dsa_devlink_sb_occ_port_pool_get,
+ .sb_occ_tc_port_bind_get = dsa_devlink_sb_occ_tc_port_bind_get,
+};
+
+static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds)
+{
+ const struct dsa_device_ops *tag_ops = ds->dst->tag_ops;
+ struct dsa_switch_tree *dst = ds->dst;
+ int err;
+
+ if (tag_ops->proto == dst->default_proto)
+ goto connect;
+
+ rtnl_lock();
+ err = ds->ops->change_tag_protocol(ds, tag_ops->proto);
+ rtnl_unlock();
+ if (err) {
+ dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n",
+ tag_ops->name, ERR_PTR(err));
+ return err;
+ }
+
+connect:
+ if (tag_ops->connect) {
+ err = tag_ops->connect(ds);
+ if (err)
+ return err;
+ }
+
+ if (ds->ops->connect_tag_protocol) {
+ err = ds->ops->connect_tag_protocol(ds, tag_ops->proto);
+ if (err) {
+ dev_err(ds->dev,
+ "Unable to connect to tag protocol \"%s\": %pe\n",
+ tag_ops->name, ERR_PTR(err));
+ goto disconnect;
+ }
+ }
+
+ return 0;
+
+disconnect:
+ if (tag_ops->disconnect)
+ tag_ops->disconnect(ds);
+
+ return err;
+}
+
+static void dsa_switch_teardown_tag_protocol(struct dsa_switch *ds)
+{
+ const struct dsa_device_ops *tag_ops = ds->dst->tag_ops;
+
+ if (tag_ops->disconnect)
+ tag_ops->disconnect(ds);
+}
+
+static int dsa_switch_setup(struct dsa_switch *ds)
+{
+ struct dsa_devlink_priv *dl_priv;
+ struct device_node *dn;
+ int err;
+
+ if (ds->setup)
+ return 0;
+
+ /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
+ * driver and before ops->setup() has run, since the switch drivers and
+ * the slave MDIO bus driver rely on these values for probing PHY
+ * devices or not
+ */
+ ds->phys_mii_mask |= dsa_user_ports(ds);
+
+ /* Add the switch to devlink before calling setup, so that setup can
+ * add dpipe tables
+ */
+ ds->devlink =
+ devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv), ds->dev);
+ if (!ds->devlink)
+ return -ENOMEM;
+ dl_priv = devlink_priv(ds->devlink);
+ dl_priv->ds = ds;
+
+ err = dsa_switch_register_notifier(ds);
+ if (err)
+ goto devlink_free;
+
+ ds->configure_vlan_while_not_filtering = true;
+
+ err = ds->ops->setup(ds);
+ if (err < 0)
+ goto unregister_notifier;
+
+ err = dsa_switch_setup_tag_protocol(ds);
+ if (err)
+ goto teardown;
+
+ if (!ds->slave_mii_bus && ds->ops->phy_read) {
+ ds->slave_mii_bus = mdiobus_alloc();
+ if (!ds->slave_mii_bus) {
+ err = -ENOMEM;
+ goto teardown;
+ }
+
+ dsa_slave_mii_bus_init(ds);
+
+ dn = of_get_child_by_name(ds->dev->of_node, "mdio");
+
+ err = of_mdiobus_register(ds->slave_mii_bus, dn);
+ of_node_put(dn);
+ if (err < 0)
+ goto free_slave_mii_bus;
+ }
+
+ ds->setup = true;
+ devlink_register(ds->devlink);
+ return 0;
+
+free_slave_mii_bus:
+ if (ds->slave_mii_bus && ds->ops->phy_read)
+ mdiobus_free(ds->slave_mii_bus);
+teardown:
+ if (ds->ops->teardown)
+ ds->ops->teardown(ds);
+unregister_notifier:
+ dsa_switch_unregister_notifier(ds);
+devlink_free:
+ devlink_free(ds->devlink);
+ ds->devlink = NULL;
+ return err;
+}
+
+static void dsa_switch_teardown(struct dsa_switch *ds)
+{
+ if (!ds->setup)
+ return;
+
+ if (ds->devlink)
+ devlink_unregister(ds->devlink);
+
+ if (ds->slave_mii_bus && ds->ops->phy_read) {
+ mdiobus_unregister(ds->slave_mii_bus);
+ mdiobus_free(ds->slave_mii_bus);
+ ds->slave_mii_bus = NULL;
+ }
+
+ dsa_switch_teardown_tag_protocol(ds);
+
+ if (ds->ops->teardown)
+ ds->ops->teardown(ds);
+
+ dsa_switch_unregister_notifier(ds);
+
+ if (ds->devlink) {
+ devlink_free(ds->devlink);
+ ds->devlink = NULL;
+ }
+
+ ds->setup = false;
+}
+
+/* First tear down the non-shared, then the shared ports. This ensures that
+ * all work items scheduled by our switchdev handlers for user ports have
+ * completed before we destroy the refcounting kept on the shared ports.
+ */
+static void dsa_tree_teardown_ports(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list)
+ if (dsa_port_is_user(dp) || dsa_port_is_unused(dp))
+ dsa_port_teardown(dp);
+
+ dsa_flush_workqueue();
+
+ list_for_each_entry(dp, &dst->ports, list)
+ if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp))
+ dsa_port_teardown(dp);
+}
+
+static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list)
+ dsa_switch_teardown(dp->ds);
+}
+
+/* Bring shared ports up first, then non-shared ports */
+static int dsa_tree_setup_ports(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *dp;
+ int err = 0;
+
+ list_for_each_entry(dp, &dst->ports, list) {
+ if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp)) {
+ err = dsa_port_setup(dp);
+ if (err)
+ goto teardown;
+ }
+ }
+
+ list_for_each_entry(dp, &dst->ports, list) {
+ if (dsa_port_is_user(dp) || dsa_port_is_unused(dp)) {
+ err = dsa_port_setup(dp);
+ if (err) {
+ err = dsa_port_setup_as_unused(dp);
+ if (err)
+ goto teardown;
+ }
+ }
+ }
+
+ return 0;
+
+teardown:
+ dsa_tree_teardown_ports(dst);
+
+ return err;
+}
+
+static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *dp;
+ int err = 0;
+
+ list_for_each_entry(dp, &dst->ports, list) {
+ err = dsa_switch_setup(dp->ds);
+ if (err) {
+ dsa_tree_teardown_switches(dst);
+ break;
+ }
+ }
+
+ return err;
+}
+
+static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *cpu_dp;
+ int err = 0;
+
+ rtnl_lock();
+
+ dsa_tree_for_each_cpu_port(cpu_dp, dst) {
+ struct net_device *master = cpu_dp->master;
+ bool admin_up = (master->flags & IFF_UP) &&
+ !qdisc_tx_is_noop(master);
+
+ err = dsa_master_setup(master, cpu_dp);
+ if (err)
+ break;
+
+ /* Replay master state event */
+ dsa_tree_master_admin_state_change(dst, master, admin_up);
+ dsa_tree_master_oper_state_change(dst, master,
+ netif_oper_up(master));
+ }
+
+ rtnl_unlock();
+
+ return err;
+}
+
+static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
+{
+ struct dsa_port *cpu_dp;
+
+ rtnl_lock();
+
+ dsa_tree_for_each_cpu_port(cpu_dp, dst) {
+ struct net_device *master = cpu_dp->master;
+
+ /* Synthesizing an "admin down" state is sufficient for
+ * the switches to get a notification if the master is
+ * currently up and running.
+ */
+ dsa_tree_master_admin_state_change(dst, master, false);
+
+ dsa_master_teardown(master);
+ }
+
+ rtnl_unlock();
+}
+
+static int dsa_tree_setup_lags(struct dsa_switch_tree *dst)
+{
+ unsigned int len = 0;
+ struct dsa_port *dp;
+
+ list_for_each_entry(dp, &dst->ports, list) {
+ if (dp->ds->num_lag_ids > len)
+ len = dp->ds->num_lag_ids;
+ }
+
+ if (!len)
+ return 0;
+
+ dst->lags = kcalloc(len, sizeof(*dst->lags), GFP_KERNEL);
+ if (!dst->lags)
+ return -ENOMEM;
+
+ dst->lags_len = len;
+ return 0;
+}
+
+static void dsa_tree_teardown_lags(struct dsa_switch_tree *dst)
+{
+ kfree(dst->lags);
+}
+
+static int dsa_tree_setup(struct dsa_switch_tree *dst)
+{
+ bool complete;
+ int err;
+
+ if (dst->setup) {
+ pr_err("DSA: tree %d already setup! Disjoint trees?\n",
+ dst->index);
+ return -EEXIST;
+ }
+
+ complete = dsa_tree_setup_routing_table(dst);
+ if (!complete)
+ return 0;
+
+ err = dsa_tree_setup_cpu_ports(dst);
+ if (err)
+ return err;
+
+ err = dsa_tree_setup_switches(dst);
+ if (err)
+ goto teardown_cpu_ports;
+
+ err = dsa_tree_setup_ports(dst);
+ if (err)
+ goto teardown_switches;
+
+ err = dsa_tree_setup_master(dst);
+ if (err)
+ goto teardown_ports;
+
+ err = dsa_tree_setup_lags(dst);
+ if (err)
+ goto teardown_master;
+
+ dst->setup = true;
+
+ pr_info("DSA: tree %d setup\n", dst->index);
+
+ return 0;
+
+teardown_master:
+ dsa_tree_teardown_master(dst);
+teardown_ports:
+ dsa_tree_teardown_ports(dst);
+teardown_switches:
+ dsa_tree_teardown_switches(dst);
+teardown_cpu_ports:
+ dsa_tree_teardown_cpu_ports(dst);
+
+ return err;
+}
+
+static void dsa_tree_teardown(struct dsa_switch_tree *dst)
+{
+ struct dsa_link *dl, *next;
+
+ if (!dst->setup)
+ return;
+
+ dsa_tree_teardown_lags(dst);
+
+ dsa_tree_teardown_master(dst);
+
+ dsa_tree_teardown_ports(dst);
+
+ dsa_tree_teardown_switches(dst);
+
+ dsa_tree_teardown_cpu_ports(dst);
+
+ list_for_each_entry_safe(dl, next, &dst->rtable, list) {
+ list_del(&dl->list);
+ kfree(dl);
+ }
+
+ pr_info("DSA: tree %d torn down\n", dst->index);
+
+ dst->setup = false;
+}
+
+static int dsa_tree_bind_tag_proto(struct dsa_switch_tree *dst,
+ const struct dsa_device_ops *tag_ops)
+{
+ const struct dsa_device_ops *old_tag_ops = dst->tag_ops;
+ struct dsa_notifier_tag_proto_info info;
+ int err;
+
+ dst->tag_ops = tag_ops;
+
+ /* Notify the switches from this tree about the connection
+ * to the new tagger
+ */
+ info.tag_ops = tag_ops;
+ err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_CONNECT, &info);
+ if (err && err != -EOPNOTSUPP)
+ goto out_disconnect;
+
+ /* Notify the old tagger about the disconnection from this tree */
+ info.tag_ops = old_tag_ops;
+ dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info);
+
+ return 0;
+
+out_disconnect:
+ info.tag_ops = tag_ops;
+ dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info);
+ dst->tag_ops = old_tag_ops;
+
+ return err;
+}
+
+/* Since the dsa/tagging sysfs device attribute is per master, the assumption
+ * is that all DSA switches within a tree share the same tagger, otherwise
+ * they would have formed disjoint trees (different "dsa,member" values).
+ */
+int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
+ const struct dsa_device_ops *tag_ops,
+ const struct dsa_device_ops *old_tag_ops)
+{
+ struct dsa_notifier_tag_proto_info info;
+ struct dsa_port *dp;
+ int err = -EBUSY;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ /* At the moment we don't allow changing the tag protocol under
+ * traffic. The rtnl_mutex also happens to serialize concurrent
+ * attempts to change the tagging protocol. If we ever lift the IFF_UP
+ * restriction, there needs to be another mutex which serializes this.
+ */
+ dsa_tree_for_each_user_port(dp, dst) {
+ if (dsa_port_to_master(dp)->flags & IFF_UP)
+ goto out_unlock;
+
+ if (dp->slave->flags & IFF_UP)
+ goto out_unlock;
+ }
+
+ /* Notify the tag protocol change */
+ info.tag_ops = tag_ops;
+ err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info);
+ if (err)
+ goto out_unwind_tagger;
+
+ err = dsa_tree_bind_tag_proto(dst, tag_ops);
+ if (err)
+ goto out_unwind_tagger;
+
+ rtnl_unlock();
+
+ return 0;
+
+out_unwind_tagger:
+ info.tag_ops = old_tag_ops;
+ dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info);
+out_unlock:
+ rtnl_unlock();
+ return err;
+}
+
+static void dsa_tree_master_state_change(struct dsa_switch_tree *dst,
+ struct net_device *master)
+{
+ struct dsa_notifier_master_state_info info;
+ struct dsa_port *cpu_dp = master->dsa_ptr;
+
+ info.master = master;
+ info.operational = dsa_port_master_is_operational(cpu_dp);
+
+ dsa_tree_notify(dst, DSA_NOTIFIER_MASTER_STATE_CHANGE, &info);
+}
+
+void dsa_tree_master_admin_state_change(struct dsa_switch_tree *dst,
+ struct net_device *master,
+ bool up)
+{
+ struct dsa_port *cpu_dp = master->dsa_ptr;
+ bool notify = false;
+
+ /* Don't keep track of admin state on LAG DSA masters,
+ * but rather just of physical DSA masters
+ */
+ if (netif_is_lag_master(master))
+ return;
+
+ if ((dsa_port_master_is_operational(cpu_dp)) !=
+ (up && cpu_dp->master_oper_up))
+ notify = true;
+
+ cpu_dp->master_admin_up = up;
+
+ if (notify)
+ dsa_tree_master_state_change(dst, master);
+}
+
+void dsa_tree_master_oper_state_change(struct dsa_switch_tree *dst,
+ struct net_device *master,
+ bool up)
+{
+ struct dsa_port *cpu_dp = master->dsa_ptr;
+ bool notify = false;
+
+ /* Don't keep track of oper state on LAG DSA masters,
+ * but rather just of physical DSA masters
+ */
+ if (netif_is_lag_master(master))
+ return;
+
+ if ((dsa_port_master_is_operational(cpu_dp)) !=
+ (cpu_dp->master_admin_up && up))
+ notify = true;
+
+ cpu_dp->master_oper_up = up;
+
+ if (notify)
+ dsa_tree_master_state_change(dst, master);
+}
+
+static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
+{
+ struct dsa_switch_tree *dst = ds->dst;
+ struct dsa_port *dp;
+
+ dsa_switch_for_each_port(dp, ds)
+ if (dp->index == index)
+ return dp;
+
+ dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+ if (!dp)
+ return NULL;
+
+ dp->ds = ds;
+ dp->index = index;
+
+ mutex_init(&dp->addr_lists_lock);
+ mutex_init(&dp->vlans_lock);
+ INIT_LIST_HEAD(&dp->fdbs);
+ INIT_LIST_HEAD(&dp->mdbs);
+ INIT_LIST_HEAD(&dp->vlans);
+ INIT_LIST_HEAD(&dp->list);
+ list_add_tail(&dp->list, &dst->ports);
+
+ return dp;
+}
+
+static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
+{
+ if (!name)
+ name = "eth%d";
+
+ dp->type = DSA_PORT_TYPE_USER;
+ dp->name = name;
+
+ return 0;
+}
+
+static int dsa_port_parse_dsa(struct dsa_port *dp)
+{
+ dp->type = DSA_PORT_TYPE_DSA;
+
+ return 0;
+}
+
+static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp,
+ struct net_device *master)
+{
+ enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE;
+ struct dsa_switch *mds, *ds = dp->ds;
+ unsigned int mdp_upstream;
+ struct dsa_port *mdp;
+
+ /* It is possible to stack DSA switches onto one another when that
+ * happens the switch driver may want to know if its tagging protocol
+ * is going to work in such a configuration.
+ */
+ if (dsa_slave_dev_check(master)) {
+ mdp = dsa_slave_to_port(master);
+ mds = mdp->ds;
+ mdp_upstream = dsa_upstream_port(mds, mdp->index);
+ tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream,
+ DSA_TAG_PROTO_NONE);
+ }
+
+ /* If the master device is not itself a DSA slave in a disjoint DSA
+ * tree, then return immediately.
+ */
+ return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol);
+}
+
+static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master,
+ const char *user_protocol)
+{
+ const struct dsa_device_ops *tag_ops = NULL;
+ struct dsa_switch *ds = dp->ds;
+ struct dsa_switch_tree *dst = ds->dst;
+ enum dsa_tag_protocol default_proto;
+
+ /* Find out which protocol the switch would prefer. */
+ default_proto = dsa_get_tag_protocol(dp, master);
+ if (dst->default_proto) {
+ if (dst->default_proto != default_proto) {
+ dev_err(ds->dev,
+ "A DSA switch tree can have only one tagging protocol\n");
+ return -EINVAL;
+ }
+ } else {
+ dst->default_proto = default_proto;
+ }
+
+ /* See if the user wants to override that preference. */
+ if (user_protocol) {
+ if (!ds->ops->change_tag_protocol) {
+ dev_err(ds->dev, "Tag protocol cannot be modified\n");
+ return -EINVAL;
+ }
+
+ tag_ops = dsa_find_tagger_by_name(user_protocol);
+ if (IS_ERR(tag_ops)) {
+ dev_warn(ds->dev,
+ "Failed to find a tagging driver for protocol %s, using default\n",
+ user_protocol);
+ tag_ops = NULL;
+ }
+ }
+
+ if (!tag_ops)
+ tag_ops = dsa_tag_driver_get(default_proto);
+
+ if (IS_ERR(tag_ops)) {
+ if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
+ return -EPROBE_DEFER;
+
+ dev_warn(ds->dev, "No tagger for this switch\n");
+ return PTR_ERR(tag_ops);
+ }
+
+ if (dst->tag_ops) {
+ if (dst->tag_ops != tag_ops) {
+ dev_err(ds->dev,
+ "A DSA switch tree can have only one tagging protocol\n");
+
+ dsa_tag_driver_put(tag_ops);
+ return -EINVAL;
+ }
+
+ /* In the case of multiple CPU ports per switch, the tagging
+ * protocol is still reference-counted only per switch tree.
+ */
+ dsa_tag_driver_put(tag_ops);
+ } else {
+ dst->tag_ops = tag_ops;
+ }
+
+ dp->master = master;
+ dp->type = DSA_PORT_TYPE_CPU;
+ dsa_port_set_tag_protocol(dp, dst->tag_ops);
+ dp->dst = dst;
+
+ /* At this point, the tree may be configured to use a different
+ * tagger than the one chosen by the switch driver during
+ * .setup, in the case when a user selects a custom protocol
+ * through the DT.
+ *
+ * This is resolved by syncing the driver with the tree in
+ * dsa_switch_setup_tag_protocol once .setup has run and the
+ * driver is ready to accept calls to .change_tag_protocol. If
+ * the driver does not support the custom protocol at that
+ * point, the tree is wholly rejected, thereby ensuring that the
+ * tree and driver are always in agreement on the protocol to
+ * use.
+ */
+ return 0;
+}
+
+static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
+{
+ struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
+ const char *name = of_get_property(dn, "label", NULL);
+ bool link = of_property_read_bool(dn, "link");
+
+ dp->dn = dn;
+
+ if (ethernet) {
+ struct net_device *master;
+ const char *user_protocol;
+
+ master = of_find_net_device_by_node(ethernet);
+ of_node_put(ethernet);
+ if (!master)
+ return -EPROBE_DEFER;
+
+ user_protocol = of_get_property(dn, "dsa-tag-protocol", NULL);
+ return dsa_port_parse_cpu(dp, master, user_protocol);
+ }
+
+ if (link)
+ return dsa_port_parse_dsa(dp);
+
+ return dsa_port_parse_user(dp, name);
+}
+
+static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
+ struct device_node *dn)
+{
+ struct device_node *ports, *port;
+ struct dsa_port *dp;
+ int err = 0;
+ u32 reg;
+
+ ports = of_get_child_by_name(dn, "ports");
+ if (!ports) {
+ /* The second possibility is "ethernet-ports" */
+ ports = of_get_child_by_name(dn, "ethernet-ports");
+ if (!ports) {
+ dev_err(ds->dev, "no ports child node found\n");
+ return -EINVAL;
+ }
+ }
+
+ for_each_available_child_of_node(ports, port) {
+ err = of_property_read_u32(port, "reg", &reg);
+ if (err) {
+ of_node_put(port);
+ goto out_put_node;
+ }
+
+ if (reg >= ds->num_ports) {
+ dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%u)\n",
+ port, reg, ds->num_ports);
+ of_node_put(port);
+ err = -EINVAL;
+ goto out_put_node;
+ }
+
+ dp = dsa_to_port(ds, reg);
+
+ err = dsa_port_parse_of(dp, port);
+ if (err) {
+ of_node_put(port);
+ goto out_put_node;
+ }
+ }
+
+out_put_node:
+ of_node_put(ports);
+ return err;
+}
+
+static int dsa_switch_parse_member_of(struct dsa_switch *ds,
+ struct device_node *dn)
+{
+ u32 m[2] = { 0, 0 };
+ int sz;
+
+ /* Don't error out if this optional property isn't found */
+ sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
+ if (sz < 0 && sz != -EINVAL)
+ return sz;
+
+ ds->index = m[1];
+
+ ds->dst = dsa_tree_touch(m[0]);
+ if (!ds->dst)
+ return -ENOMEM;
+
+ if (dsa_switch_find(ds->dst->index, ds->index)) {
+ dev_err(ds->dev,
+ "A DSA switch with index %d already exists in tree %d\n",
+ ds->index, ds->dst->index);
+ return -EEXIST;
+ }
+
+ if (ds->dst->last_switch < ds->index)
+ ds->dst->last_switch = ds->index;
+
+ return 0;
+}
+
+static int dsa_switch_touch_ports(struct dsa_switch *ds)
+{
+ struct dsa_port *dp;
+ int port;
+
+ for (port = 0; port < ds->num_ports; port++) {
+ dp = dsa_port_touch(ds, port);
+ if (!dp)
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
+{
+ int err;
+
+ err = dsa_switch_parse_member_of(ds, dn);
+ if (err)
+ return err;
+
+ err = dsa_switch_touch_ports(ds);
+ if (err)
+ return err;
+
+ return dsa_switch_parse_ports_of(ds, dn);
+}
+
+static int dsa_port_parse(struct dsa_port *dp, const char *name,
+ struct device *dev)
+{
+ if (!strcmp(name, "cpu")) {
+ struct net_device *master;
+
+ master = dsa_dev_to_net_device(dev);
+ if (!master)
+ return -EPROBE_DEFER;
+
+ dev_put(master);
+
+ return dsa_port_parse_cpu(dp, master, NULL);
+ }
+
+ if (!strcmp(name, "dsa"))
+ return dsa_port_parse_dsa(dp);
+
+ return dsa_port_parse_user(dp, name);
+}
+
+static int dsa_switch_parse_ports(struct dsa_switch *ds,
+ struct dsa_chip_data *cd)
+{
+ bool valid_name_found = false;
+ struct dsa_port *dp;
+ struct device *dev;
+ const char *name;
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < DSA_MAX_PORTS; i++) {
+ name = cd->port_names[i];
+ dev = cd->netdev[i];
+ dp = dsa_to_port(ds, i);
+
+ if (!name)
+ continue;
+
+ err = dsa_port_parse(dp, name, dev);
+ if (err)
+ return err;
+
+ valid_name_found = true;
+ }
+
+ if (!valid_name_found && i == DSA_MAX_PORTS)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
+{
+ int err;
+
+ ds->cd = cd;
+
+ /* We don't support interconnected switches nor multiple trees via
+ * platform data, so this is the unique switch of the tree.
+ */
+ ds->index = 0;
+ ds->dst = dsa_tree_touch(0);
+ if (!ds->dst)
+ return -ENOMEM;
+
+ err = dsa_switch_touch_ports(ds);
+ if (err)
+ return err;
+
+ return dsa_switch_parse_ports(ds, cd);
+}
+
+static void dsa_switch_release_ports(struct dsa_switch *ds)
+{
+ struct dsa_port *dp, *next;
+
+ dsa_switch_for_each_port_safe(dp, next, ds) {
+ WARN_ON(!list_empty(&dp->fdbs));
+ WARN_ON(!list_empty(&dp->mdbs));
+ WARN_ON(!list_empty(&dp->vlans));
+ list_del(&dp->list);
+ kfree(dp);
+ }
+}
+
+static int dsa_switch_probe(struct dsa_switch *ds)
+{
+ struct dsa_switch_tree *dst;
+ struct dsa_chip_data *pdata;
+ struct device_node *np;
+ int err;
+
+ if (!ds->dev)
+ return -ENODEV;
+
+ pdata = ds->dev->platform_data;
+ np = ds->dev->of_node;
+
+ if (!ds->num_ports)
+ return -EINVAL;
+
+ if (np) {
+ err = dsa_switch_parse_of(ds, np);
+ if (err)
+ dsa_switch_release_ports(ds);
+ } else if (pdata) {
+ err = dsa_switch_parse(ds, pdata);
+ if (err)
+ dsa_switch_release_ports(ds);
+ } else {
+ err = -ENODEV;
+ }
+
+ if (err)
+ return err;
+
+ dst = ds->dst;
+ dsa_tree_get(dst);
+ err = dsa_tree_setup(dst);
+ if (err) {
+ dsa_switch_release_ports(ds);
+ dsa_tree_put(dst);
+ }
+
+ return err;
+}
+
+int dsa_register_switch(struct dsa_switch *ds)
+{
+ int err;
+
+ mutex_lock(&dsa2_mutex);
+ err = dsa_switch_probe(ds);
+ dsa_tree_put(ds->dst);
+ mutex_unlock(&dsa2_mutex);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(dsa_register_switch);
+
+static void dsa_switch_remove(struct dsa_switch *ds)
+{
+ struct dsa_switch_tree *dst = ds->dst;
+
+ dsa_tree_teardown(dst);
+ dsa_switch_release_ports(ds);
+ dsa_tree_put(dst);
+}
+
+void dsa_unregister_switch(struct dsa_switch *ds)
+{
+ mutex_lock(&dsa2_mutex);
+ dsa_switch_remove(ds);
+ mutex_unlock(&dsa2_mutex);
+}
+EXPORT_SYMBOL_GPL(dsa_unregister_switch);
+
+/* If the DSA master chooses to unregister its net_device on .shutdown, DSA is
+ * blocking that operation from completion, due to the dev_hold taken inside
+ * netdev_upper_dev_link. Unlink the DSA slave interfaces from being uppers of
+ * the DSA master, so that the system can reboot successfully.
+ */
+void dsa_switch_shutdown(struct dsa_switch *ds)
+{
+ struct net_device *master, *slave_dev;
+ struct dsa_port *dp;
+
+ mutex_lock(&dsa2_mutex);
+
+ if (!ds->setup)
+ goto out;
+
+ rtnl_lock();
+
+ dsa_switch_for_each_user_port(dp, ds) {
+ master = dsa_port_to_master(dp);
+ slave_dev = dp->slave;
+
+ netdev_upper_dev_unlink(master, slave_dev);
+ }
+
+ /* Disconnect from further netdevice notifiers on the master,
+ * since netdev_uses_dsa() will now return false.
+ */
+ dsa_switch_for_each_cpu_port(dp, ds)
+ dp->master->dsa_ptr = NULL;
+
+ rtnl_unlock();
+out:
+ mutex_unlock(&dsa2_mutex);
+}
+EXPORT_SYMBOL_GPL(dsa_switch_shutdown);